Most of us will probably only ever use a handful of layer blending modes in Photoshop. Normal, Darken, Multiply, Screen, and maybe Overlay. This mostly down to the fact that what they do is quite obvious. We often ignore many of the other blend modes because when we scroll through them they don’t seem to be of much use at all. But mostly because we don’t understand how they work.
In this video, Unmesh Dinda at PiXimperfect walks us through all 27 of Photoshop’s layer blending modes and exactly how they work. These blend modes don’t just exist for layers, though. They often come up as an option for Photoshop’s various tools like the brush, clone stamp and healing brush tools. So it’s useful to know what they do.